Fillers

Smooth out walls and surfaces with fillers from Biltema 

Smooth out uneven walls, cracks, or dents with fillers from Biltema. Whether you’re dealing with small holes from picture hooks or preparing larger areas before painting, our fillers are made to give a clean and even base. They’re easy to apply with a filling knife, dry quickly, and can be sanded down for a flat finish. With the right filler, it’s easier to get walls and surfaces ready for painting or wallpapering without visible marks or bumps. 

Choose the right fillers based on the application areas 

Not all fillers are the same – each type has specific properties depending on where and how it’s meant to be used. That’s why it’s important to choose your filler based on the surface you're working on and the level of smoothness you want to achieve. Here are some of the most common types and their uses. 

Wall filler 

Wall filler is suitable for most wall and ceiling surfaces. It comes in various grain sizes, affecting how smooth the final result will be – the finer the grain, the smoother the surface. Ideal for preparing walls before painting or wallpapering. 

Roll-on filler 

Roll-on filler is designed to be applied with a roller, making it especially useful for large areas. It's great for covering over textured wallpaper or glass fibre fabric, helping to create a flat, even surface with less effort. 

Bathroom filler (moisture-resistant) 

Bathroom filler is formulated specifically for use in wet areas like bathrooms and utility rooms. It resists moisture and helps prevent mould growth, making it an essential choice for environments exposed to high humidity. 

Exterior filler 

Exterior filler is specially developed for outdoor use. It’s weather-resistant and durable, standing up to rain, temperature changes, and other harsh conditions – ideal for filling cracks or smoothing rough exterior surfaces. 

Wood filler 

Wood filler is used to fill cracks, dents, and imperfections in wooden surfaces. It remains flexible once dry, allowing the wood to expand and contract naturally without causing the filler to crack. Great for repairs before painting or varnishing woodwork.  

Pre-mixed filler or powder – what should you choose? 

Fillers are available either ready-mixed in tubs or as a dry powder. Ready-mixed filler is convenient if you want to get started right away. It’s already blended to the right consistency, so you can open the lid and apply it directly with a filling knife. This option is handy for smaller repairs or if you only need a little at a time. 

Powder filler comes in bags and needs to be mixed with water before use. It takes a few minutes to prepare, but it gives you more control over the thickness and working time. Powder is often the better choice for larger repairs since you can mix exactly the amount you need and adjust the texture to suit the job. 

The choice depends on the size of the repair, your filler work frequency, and whether you prefer quick application or more flexibility when mixing. 

How to use filler 

Filler is a simple way to repair holes, cracks, and uneven surfaces before painting or wallpapering, but taking the time to do it right makes a big difference. Here’s a step-by-step guide to get a smooth, durable finish. 

1. Prepare the surface

Start by cleaning the area where you’ll be applying filler. Brush away dust, loose paint, and debris. If you’re filling a crack, it often helps to widen it slightly with a filling knife so the filler can grip better. For damp or greasy spots, wipe down the surface and let it dry fully before you begin. 

2. Use joint tape where needed

For larger gaps, seams, or repairs on plasterboard, joint tape prevents cracks from reappearing later. Place the tape firmly over the joint before spreading filler on top. 

3. Mix or stir the filler

If you’re using powder filler, mix it in a clean bucket with water until you have a smooth paste. Pre-mixed filler should be stirred lightly to ensure an even consistency before application. 

4. Apply the filler

With a filling knife or spatula, press the filler into the hole or crack. Use firm strokes to make sure it’s packed in tightly, then smooth out the surface with long, even movements. For larger areas, work in sections so the filler stays workable. 

5. Let it dry

Drying time depends on the type of filler, the thickness of the layer, and the room’s temperature. Thin layers may dry in an hour, while deeper repairs can take several hours. Always check the instructions on the packaging. 

6. Sand the surface

Once completely dry, use sanding paper or a sanding block to level out the surface. Start with a medium grit to remove excess material, then finish with a finer grit for a smooth result. 

7. Apply a second layer of filler if needed

Deep holes or uneven patches often need more than one coat. Apply a thin second layer of filler, let it dry, and sand again until the surface feels flat and ready for finishing.  

8. Clean up and finish

Brush away dust after sanding and wipe down the surface. Now it’s ready for primer, paint, or wallpaper. 

Tools and accessories that make filling easier 

When you’re working with filler, having the right tools can make a big difference in both speed and finish. At Biltema, you’ll find a wide range of filler products. Like our selection of filling tools, where you can find filler knives, filling knife sets, sanding blocks, and sanding paper rolls – all made for smoothing out walls, ceilings, and other surfaces. Wider blades are useful for covering large areas, while narrower ones give you more control in corners or smaller spots. 

To support the job, we also offer a range of accessories for filling, such as joint tape for covering seams or cracks before applying filler, and masking tape to protect nearby surfaces during the process. These small extras help you achieve a cleaner result and minimise the need for additional clean-up.   

See our full selection of painting gear here

Pay & Collect your fillers today 

At Biltema, you’ll find a range of fillers for indoor and outdoor use – whether you’re repairing small cracks, smoothing out walls, or preparing surfaces before painting. The selection includes everything from light fillers for fine finishing work to stronger compounds for deeper holes or uneven surfaces. Whether you're working on plaster, wood, or masonry, there’s a product that suits the task. Easy to apply and sand down, our fillers are made for both DIY projects and regular maintenance jobs around the home or workshop. 

When you order filler or related accessories from Biltema, you can choose to pay online and collect your items at a nearby store with our Pay & Collect service within 2 hours. 

FAQ

What is filler?

Filler is a material used to repair and smooth uneven surfaces on walls, ceilings, wood, or floors. It helps eliminate holes, cracks, and dents, creating a level base for painting or finishing. Different types of fillers are available for specific surfaces and applications.

How long does filler take to dry?

Drying time varies depending on the type of filler, the thickness of the applied layer, and the room temperature. Some fillers can dry within an hour, while others may take several hours. Always check the product packaging for accurate drying instructions and recommended curing times.

Which filler should I use?

For rough surfaces or large gaps, use coarse filler to build a strong base. Medium or all-purpose filler works for general repairs. If you want a fine, smooth finish for painting or wallpapering, select fine filler or joint filler designed for surface levelling.